“Particularly since the surge in Afghanistan began, we have seen progress toward helping establish a country that can govern itself, defend its borders, and be an important ally in fighting terrorism," Castle said in the Republican weekly radio address.

A group of House and Senate Republicans traveled to Afghanistan, the site of protracted U.S. military involvement since 2001, to assess the progress of war efforts there.

Castle praised Obama for elements of his national security strategy, particularly heeding military commanders' wishes, keeping on Robert Gates as secretary of Defense, and showing a degree of flexibility in decision-making.

But the Delaware congressman stressed the need for Obama to work with the GOP when it comes to overhauling the nation's intelligence infrastructure.

"To circumvent and pre-empt this threat, we rely heavily on our intelligence gathering systems and professionals - at home and abroad," Castle said. "The arrest of Umar Farouk Abdulmutallab makes clear there is much to be reviewed in the way that intelligence is shared, collected, analyzed, and in our methods of approach."

“We cannot rest on one pattern or approach to tracking or analyzing threats to our national security," he added. "The administration should work with congressional Republicans to review and update our current counterterrorism systems to meet the emerging and multiplying threats from al-Qaeda."

The address is also notable for its use as a platform to showcase one of the Republican Party's most promising Senate recruits in 2010.